Figure 6. Sulindac sulfide induced MZF1 expression, and MZF1 siRNA reduced the enhancement in DR5 expression by sulindac sulfide.
(a) Western blotting for MZF1. SW480 cells were treated with the indicated concentrations of sulindac sulfide for 24 h. β-actin was used as a loading control. (b) The luciferase assay was performed as described in Figure 5 with the indicated reporter plasmids. The MZF1 overexpression plasmid pcDNA3.1MZF1 was co-transfected with luciferase reporter plasmids as described in the Materials and Methods. The fold induction in promoter activity (pcDNA3.1MZF1 vs control vector pcDNA3.1) was shown as a bar graph. Data represent the means +/− S.D. of three determinations. *: p < 0.05 (c) Western blotting for DR5 and MZF1. SW480 cells were transfected with MZF1 siRNA or negative control siRNA at 80 nM. Twenty-four hours after the transfection, cells were treated with or without 200 μM sulindac sulfide for 24 h. β-actin was used as a loading control. −: treated with DMSO, mock: transfection was performed without any siRNA.